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AT42QT1011 Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT42QT1011 Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 18 page  9 9542G–AT42–03/10 AT42QT1011 Figure 3-6. Obtaining HeartBeat Pulses with a Pull-up Resistor If the sensor is wired to a microcontroller as shown in Figure 3-7 on page 9, the microcontroller can reconfigure the load resistor to either Vss or Vdd depending on the output state of the QT1011, so that the pulses are evident in either state. Figure 3-7. Using a Microcontroller to Obtain HeartBeat Pulses in Either Output State Electromechanical devices like relays will usually ignore the short HeartBeat pulse. The pulse also has too low a duty cycle to visibly affect LEDs. It can be filtered completely if desired, by adding an RC filter to the output, or if interfacing directly and only to a high-impedance CMOS input, by doing nothing or at most adding a small noncritical capacitor from OUT to Vss. 3.9.3 Output Drive The OUT pin is active high and can sink or source up to 2 mA. When a large value of Cs (>20 nF) is used the OUT current should be limited to <1 mA to prevent gain-shifting side effects, which happen when the load current creates voltage drops on the die and bonding wires; these small shifts can materially influence the signal level to cause detection instability. 6 4 5 VDD 3 1 OUT SNS SYNC SNSK VSS VDD 2 Ro HeartBeat™Pulses Microcontroller PORT_M.x PORT_M.y 6 4 3 1 OUT SNS SYNC SNSK Ro |
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